8EPA.Non-road engine and vehicle emission study[R].Ann Arbor,MI:Office of Mobile Sources,1991.
9ABOLHASANI S,FREY H C,KIM K,et al.Real-world in-use activity,fuel use,and emissions for nonroad construction vehicles:a case study for excavators[J].Journal of the Air & Waste Management Association,2008,58:10331046.
10BAN-WEISS G A,MCLAUGHLIN J P,HARLEY R A,et al.Long-term changes in emissions of nitrogen oxides and particulate matter from on-road gasoline and diesel vehicles[J].Atmospheric Environment,2008,42:220-232.
